Download Method 1

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B. What is NI Multisim?
Capture
Simulate
Analysis
Unified environment for teaching
circuit theory and design through
capture and simulation
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B. The NI Multisim Environment
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Menu items,
system/design
toolbars
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Resizable
workspace area
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Component tool bar
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Design Toolbox
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Status Indicator
B. Exercise 1 – Start Multisim and Get Familiarize
Approximate time to complete: 2 minutes
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C. Simulation in Multisim
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There is no need to be a SPICE expert
Multisim makes simulation easy
Method 1 – Interactive SPICE Simulation
Method 2 – SPICE Analyses
MCU Simulation Options
Stop Simulation
Pause Simulation
Start Simulation
Simulation Toolbar
Interactive Simulation Status
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C. Simulation Method 1: Interactive Simulation
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Over 20 instruments are the fastest and easiest way to
measure results
Connect to your circuits just like real equipment
Double-click the schematic symbol to open the front panel
Instruments Toolbar
Schematic Symbol
Multimeter
Function Generator
Oscilloscope
Bode Analyzer
Logic Analyzer
Measurement Probe
LabVIEW Based Instruments
Current Probe
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Front Panel
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B. Component Selection | Component Toolbar
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Sources
Basic
Diodes
Transistors
Analog
TTL
CMOS
Miscellaneous Digital
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Mixed Signal
Indicators
Miscellaneous
Electromechanical
RF
Hierarchical blocks
Bus
B. Component Selection | Component Browser
Ctrl+W or select
from toolbar
Categorized by:
1. Database
2. Group
3. Family
4. Component
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Rotating
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B. Wiring Components
There are 2 main methods for wiring circuits:
1. Click on source, then destination terminals
2. Drop components directly onto wires or terminals
Cursor
Mode
Place or Move Part
Select Menu Item or Icon
Place Wire
Re-wire
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B. Grounding
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The concept of “ground” is a way of defining a point common to all
voltages. It represents 0 volts.
In power systems, the planet Earth itself is used for this reference
point (most home power circuits are ultimately “grounded” to the
earth's surface for lightning protection).
Multisim supports a multipoint grounding system. Each ground is
connected directly to the ground plane.
Not all circuits require grounding for simulation. However, any circuit
that uses an opamp, transformer, controlled source or
oscilloscope must be grounded. Also, any circuit which contains
both analog and digital components should be grounded. If a circuit
is ungrounded or improperly grounded (even if it does not need
grounding in reality), it may not be simulated. If it is simulated, it
may produce inconsistent results. The linear transformer must be
grounded on both sides.
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• Changing
names of the circuit
elements
• Changing values of the circuit
elements
• Wire-color
• Ground
• Probes ( Voltage – Current )
• Multimeters ( Voltage – Current )
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C. Method 1 - Measurement Probes
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Attach to any wire in the circuit and can be named
Measures circuit properties (including differential
voltages)
Also visible as an output from analysesProperties Dialog
Toolbar Icon
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Schematic Symbol
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Ohm’s Law
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C. Method 1 - Multimeter
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Selections can be changed while simulation is running
Toolbar Icon
Schematic Symbol
Front Panel
Instruments can be
configured during simulation
You can resize the front panels
Positive Terminal
Negative Terminal
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Multimeter - Voltage
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Multimeter - Current
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X2 = 8V
Y2 = 4mA
Req = V / I = 8 V / 4 mA = 2 Kohm
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Power = I^2 * R
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Exercise 4: Saving
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Potentiometer
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A potentiometer is a manually adjustable variable resistor
with 3 terminals. The potentiometer essentially functions
as a variable voltage divider. The resistive element can
be seen as two resistors in series(potentiometer
resistance), where the wiper position determines the
resistance ratio of the first resistor to the second resistor.
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Potentiometer
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POWER
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Electric power is the energy consumption in an electrical
circuit.
The electric power P is I^2*R = I*V
P is the electric power in watt (W).
I is the current in ampere (A).
V is voltage in volt (V).
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Total power of system must be equal to zero.
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DIODE
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A diode is a semiconductor device that essentially acts
as a one-way switch for current. It allows current to flow
easily in one direction, but severely restricts current from
flowing in the opposite direction.
When a diode allows current flow, it is forward-biased.
When a diode is reverse-biased, it acts as an insulator
and does not permit current to flow.
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Ideal Diode
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Typical diode
Forward - bias
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Reverse - bias
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C. Multisim Grapher
Pinter friendly Graph !
Multiple tabs
Digital Signals
Analog Signals
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Displays Simulation Results
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View, Adjust, Save, Print and export
data
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Precise cursor measurements (x, y)
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Overlay different results to compare
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Save results for use in LabVIEW,
Signal Express, Excel, and
others
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Analog and digital signals
F. Training Options
Multisim Basics – view available courses
Key Objectives:
• Learn to capture schematics with an introduction to the
features of the Multisim user interface
• Use interactive simulation, virtual instruments, and
advanced analyses to validate a design
• Create custom components to add to your database
Ultiboard Basics – view available courses
Key Objectives:
• Apply automated and manual processes for efficient
part and trace placement
• Learn to create custom land patterns/footprints to
include in the component database
• Prepare final designs for manufacture and export to
industry-standard file formats
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F. Textbooks
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Circuits by Maharbiz and Ulaby
Microelectronic Circuits by Sedra and Smith
Principles of Electric Circuits by Floyd
Lab Exercises/Manuals
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NI myDAQ and Multisim Problems for Circuits by Doering
Circuits Laboratory Companion by Ganago and Sleight
Problems & Explorations in Microelectronics with NI
myDAQ and Multisim by Doering
Practical Teaching Ideas by Tracy Shields
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